The extreme delay machine that you've never heard before.

In short: This is a Karaoke echo machine. Words spoken in the iPhone's microphone will come back a few seconds later. It's like the echo effect you can hear at a mountain. You can get various kinds of effects by changing the delay time and the feedback rate.

To make music: Tap on the table - it sounds like "tock"......"tock"....."tock"..... Clap your hands - you'll hear "tock", "clap", "tock", "clap", "tock", "clap"... You can produce simple musical patterns this way.

Daily life use: Leave it as it is. It's fun to hear repeating sounds of ordinary life. You can use the stereo headset with the mic. Take a walk with the iPhone in your pocket and enjoy the repeating sounds around you.

In detail: "Echochops" produces a feedback delay effect (an echo effect) on the sounds from the iPhone's microphone. The feedback delay is widely used to produce rich vocal and guitar sounds. It is also used as a special kind of musical performance. You can use "Echochops" not only as a "musical" application but also as a "noisy" experiment.

- Input and output level meter
- Input and output level setting
- Delay time setting, within 60 seconds.
- Feedback rate setting, from 0% to 100%
- Direct and Delay balance setting
- Four types of audio filters (Lowpass, Highpass, Bandpass, Notch)
- Audio filter frequency setting
- Audio filer Q setting
- Parameter control by audio input/output levels
- Parameter control by tilting
- Parameter control by rotating (a compass-equipped device only)
- Mode setting to change delay time, "Glitch" or "Funny".
- Output route setting, headphone/receiver or speaker.
- Tilt angle setting for controlling
- Upside-down portrait mode for efficient use of microphone and speaker
- Delayed sound can be erased
- Works with iPod audio simultaneously
- Background audio playback (iOS 4.0 and later)

[[ ATTENTIONS ]] Due to a latency of an audio input and output, the actual delaying time will be slightly longer than the setting. A natural feedback through the air may happen because the microphone and speaker are placed closely on the iPhone. Distorted sounds or harsh grating noises will be produced depending of the setting of parameters. It would be better NOT to use this application if you cannot stand noisy sounds.

[[ Address of Gratitude ]] Thanks to Mr. Kaoru Sato (EP-4)

What's New

Version 2.0.0

- iOS 10 and later compatible
- User interface refined

Customer Reviews

Great Sounding Virtual Tape Echo


This is a simple Echoplex style app that sounds very good, but for it to be useable I need to be able to blend in the dry signal. For example, if I have the delay set for 2.0 seconds and I sing into the mic I hear no sound at all until the delay kicks in 2 seconds later. If I could hear my unaffected voice as soon as I start singing that would help a lot. Also, when the delay time is set below .03s there is nasty distortion. Maybe you could make .03s the lowest setting instead of .01s. This echo machine is still nice though. Lots of fun to play with and well worth the buck I paid for it. Looking forward to future updates.

One of the best music apps in the store!


If you are into experimental music making then this app is for you. I love this app so much that I am creating a new musical project based around it. It is only a $1, give it a spin!

I Like it!


I love the icon! (and the sounds) reminds me of a "Echoplex" guitar effects. 2nd gen. iPhone users need an adapter with two rings on the jack instead of three to be able to play through speakers.


正行 Akamatsu
16.7 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Japanese
Age Rating
Rated 4+
© Masayuki Akamatsu


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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